\(n_{H_2}=\frac{4,48}{22,4}=0,2\left(mol\right)\)
PTHH: Mg + 2HCl --> MgCl2 + H2 (1)
a ---------------> a ------> a ( mol)
Zn + 2HCl --> ZnCl2 + H2 (2)
b----------------> b ------> b (mol)
(1)(2) => \(\left\{{}\begin{matrix}24a+65b=8,9\\a+b=0,2\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}a=0,1\left(mol\right)\\b=0,1\left(mol\right)\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}m_{MgCl_2}=0,1.95=9,5\left(g\right)\\m_{ZnCl_2}=0,1.136=13,6\left(g\right)\end{matrix}\right.\)
=> \(m_{hh}=9,5+13,6=23,1\left(g\right)\)